Cylinder boring machine



Feb. 28, 1933. G. E. ANDERsr-:N

' CYLINDER Bom-NG MACHINE Original Filed Aug. 4, 1926 2 Sheets-Sheet l G. E. ANDERSEN 1,899,128

CYLINDER BORING MACHINE Feb. 28, 1933.

Original Filed Aug. 4, 1926 2 Sheets-Sheet- 2 Z'EU ,B4 n Q in hggw,

Patented'Feb. 28, 1933 UNITED; "STATBS-1 `r`|.'J'l\I1\T.AIR,A EMIL ANDEBSEN,`OF ELMHURST, ILLINOIS, ASSIGNOR (0F TWO-THIRDS JOHN D. MILNE AND ANfroN H.l TAX, or CHICAGO, ILLINoIs- Y CYLINDER BORINGl MACHINE Application filed August v4,- 1926,'Seriia1 rNcr .f126,9 68. Renewed May 19, 1932..

My invention relates to improvements in cylinder boringgmachines for internal com`v bustion engines and thelike. It has for one object to provide a new and, improvedform' of boring machine which maybe mounted on the cylinder casting and may be operated to rebore the cylinder withoutV removing it'from the engine frame and without taking down the engine entirely. Another obj ect is to provide a new 'and improved form of boring machine which will perform the boring operation smoothly and accurately and wherein any irregularities in contour of the cylinder being bored or treated willhave a minimum of effect on the operation ofthe machine. Other purposes will appearl from time to time in the specification.

My invention is illustrated more or less diagrammatically in the accompanying drawings, wherein Figure 1 is a vertical `section with'parts in elevation showing the cutting head in place; Figure 2 is a vertical section in a plane at right angles to the plane of- Figure 1 showing the centering head in place with, pants in elevation;

Figure 3 is asectiony along the line 3 3 of Figure l; e

Figure 4 is a section along line 4 4 of Figure l; l Figure 5 is a section along theline-of Figure 2; s

Figure 6 is a section through a part of the feed mechanism with parts separated;.

Figure 7 is a section similar to Figure 6 in a plane at right anglesV thereto. l y

Like parts are indicated by like characters throughout. l `l l A is an internal combustion engine cylinder though it will be understood that my invention might be usedwith any engine Vcylinder or even tobore out any cylindrical openingL whether a part of an engine or not. Proj ectf ing upwardly from this engine cylinder are a plurality of studs A1 which in this case will normally be used kto hold the head plug of the engine in place on the axle. A2 is abase plate adapted to rest on theA engine block. lIt has a plurality of apertures A2v therein,

adapted some of them to be penetrated bythe studsAl.l A4 are nuts engaging the studs A1 adapted to hold the base platein place on the Vengine housing.V Projecting upwardly from the base platev are a plurality of pads A from which project upwardlyl studs A6. These pads terminate atk their outer corners in lugs A7 in which are threaded set screws A8. The base plate A2 is centrally apertured at A9, the aperture being larger in diameter than themaximum diameter of any'cylinder to be bored.

` Supported on the pads A5 is an A-frame B. The lower arms of the A-frame terminate in cross pieces'B1 B1 terminating in pad engaging apertured feet B2, the apertures B9 being considerably larger than the studs A6. Washers B3 resty ony the upper side ofthe feet B2 and nuts B4 engage these washers whereby when the nuts are tightened up on the studs the A-frame is locked in place on the base frame. A set screw A8 engages each of the feet B2 so that these set screws may be used to adjustably position the `A-frame with respect4 to the base plate so as to center the axis thereof in line with the axis of the cylinder to be bored. B5 is a sleeve mounted at the lower end ofthe A-frame inline with the hub BG at the upper end. The hub and the sleeve are both downwardly tapered to contain the segmental bearing sleeves B7 which sleeves are tapered'on their outside to. conform toV the taper of the sockets and are cylindrical on their insides. Adjusting screws B8 threaded lin Vthe sleeve B5 and hub Bs are adaptedy kto force these segmental sleeves ydownward to-compensate for wear on theinner bearing surfaces. i

C is a boring vbar or mandrel slidable and rotatable in the bearings B7. This mandrely is of dife'rent size atthe two ends, there being a shoulder C1 intermediateV its ends, at the point where the diameter changes so that the Y bearingsleeves B7 B7 are of different size to lit the two diferent sizes of the mandrel. 'lhe lower end of the mandrel terminates in a threaded shank C2 on whichfmay be thread- Ved a truncated conical center headCBor a fitted on the small part of the mandrel and resting against the shoulder G1. This collar has a lug C8 projecting radially therefrom and may be pinned as at C9 on the mandrel or if desired be so tightly fitted that no pin is needed. j j

D is a lead screw parallel with the mandrel and mounted at either end on the A-frame by means of the cap screws D1 D1. D2 is aV ratchet whe-el` mounted for rotation about the lead screw D. This ratchet wheel has an upwardly extending hub D3 terminating in a solid head D4, the solid head being engaged by the segmental threaded members D5 which members may be brought into engagement with the lead screw. These members D5 are outwardly tapered as at DG and adapted to be engaged by the threaded sleeve D7 having atruncated ,conical socket D8 to engage the tapered surface D(S and threaded at D9 to en-A gage the thread D10 on the sleeve D3 where* by'when the sleeve D7 is screwed down the segmental members D5 are held in firm engagement with the threads on the lead screw compelling the ratchet wheel to act as a lead nut but when the sleeve is screwed up no longer holding the members against the screw, the ratchetwheel is free to move longitudinally of the lead screw independent of any rotation thereof.

E is a two-part yoke, the two parts of which are held together by the bolts E1.V

This yokesurrounds both the mandrel C and the lead screw D, there being one part above the ysleeve C7 and the other below. The ratchet wheel D2 is rotatably mounted in this yoke, one part above and one part below the hub holding it against longitudinal movement with respect to the mandrel so that movement of the lead nut along the lead screw results in identical longitudinal movement of the mandrel in its bearing. Rotation of the collar C7 and lug C8 causes this lug to engage successive ratchet teeth E2 on `the ratchet wheel and gradually rotate the nut to longitudinally move the mandrel.

i F is a worm housing socketed on the upper end of the A-frame held in place thereon by a set screw F1. This housing has a removable cover F2. The worm wheel F3 is Contained within this housing and is feathered at F4 to engage akeyway F5 in the mandrel. F6 is a worm` in mesh with the worm wheel F3 adapted to be driven through a pulley F7 and belt F8 from any suitable source of power so that rotation of the pulley and worm drives the worm wheel, and rotates the mandrel. F9 is a hand wheel removably mounted on the end of the' mandrel to assist in making adjustment thereof. It may be removed and the worm gear casing and asso# ciated parts may be drawn off and a long handle substituted whenthemandrel can be operated by hand. Y

The use and operation of my invention are as follows:

When an engine cylinder is to be bored by the use of my machine the cylinder head is removed, the pistons are drawn from above or below the cylinder as the case may be. The cylinder may or may not be taken from the engine or out of the chassis if it is an automobile cylinder, preferably not.

The base plate of my machine is placed on the cylinder block in the place ordinarily occupied by the cylinder head. The arrangement of holes through the base plate is such that the studs on substantially any standard internal combustion engine block can be passed` through some of these holes so that the base plate may be pulled in place on the block substantially concentric with the cylinder. VThe cutting mandrel is backed ofl' to the upper position and the tapered or truncated conical centering member is screwed intothe mandrel in the place ordinarily occupied by the cutting head. The mandrel is then moved down until the centering head centers itself in the bore of the cylinder. Since the frame is movably mounted on the base plate, the frame and the centering member can be moved around until the axis of rotation of `the mandrel and therefore of the centerin member and the cutting member all coincide with the central axis of the cylinder.

This manipulation of the frame with respect to the base plate may be by hand or by the use of the four adjusting screws as indicated. When the parts are centered the four clamping nuts are tightened down to hold the frame rigidly in position on the base place. `Then the mandrel is backed off, the centering member is removed and the cutting member put in its place.

If the operation is to be a power operation the pulley on the worm shaft will be driven by a belt from any suitable source of power. It will drive the worm gear and rotate the shaft or mandrel. Once each revolution of the shaft or mandrel the lugon the driving collar on the mandrel will engage the ratchet gea-r on the lead screw and give it a fractional rotation, thus feeding the mandrel downward a short distance each revolution of the cutting member. As this ratchet gear rotates it carries with it the nut on the lixed lead screw rotating that in and around the screw andpulling the drive member down along the screw, thus carrying the mandrel down. This continues until the mandrel with the drive member has been fed clear through the cylinder block, thereby boring o ut the cylinder to the desired new dimension.

At the end of the excursion the drive will be stoV ped, the compression nut associated with t e split nut on the lead screw will be backed oi", thereby permitting the segment placed on the lead nut to back out from the place on the lead screw andthe mandrel and the cutting member may be withdrawn up- Wardly back to the starting position, and the machine may then be set up for the next cylinder.

There are two side bushings,rone at the lupper and-the other at the lower end of the frame'in which themandrel is slidably and rotatably mounted. The mandrel itself is carefully made so that it is straight and so that its diameter does not vary within'narrow limits from end to end.V These bearings in which the mandrel slides and rotates are split bearings. As shown they yare segmental,

ameter of the tool.

When it is desired to perform .the operation by hand, the housing containing the worm gear and worm is releasedy from the upper end of the frame by releasing the set screw. The hand wheel at the upper end of the mandrel is removed and the worm and housing are raised upwardly off the mandrel. Since the driving connection between thepworm gear and the mandrel is by means of a key-way on the mandrel and a spline on the gear, it can easily be done. Then a crank can be put on the end ofthe mandrel and the mandrel can be rotated by hand. Of course, the cut taken in reboring a cylinder must be very light, otherwise the cylinder would be too big so that it is an operation that can be done by hand.

I claim:

1. In a boring machine, Va Verticall frame adapted to be supported on the part to be bored, a smooth cylindrical mandrel,k spaced bearings in which it is rotatably and slidably mounted, a iXed lead screw on oneside of and parallel therewith, a nut rotatably mounted on the screw, and a yoke carrying ,the nut and being provided with two spaced so that the nut may be moved without rotation longitudinally along the screw. l

2. In a `boring machine, a smooth cylindrical mandrel, spaced bearings in vwhich it is rotatably and slidably mounted, a fixed lead screw parallel therewith, a nut rotatably mounted on the screw, and a yoke carrying Y the nut held held against longitudinal movement with respect to the mandrel in which the mandrel is rotatably mounted, means as sociated therewith whereby rotation-of the mandrel rotates the nut, the nut comprisingV a movable threaded segment, a tapered cap adapted to engage the segment to force ity into engagement with the lead screw, said tapered cap when backed off automatically releasing the segment from the screw, so that the nut Vmay be moved bodily alongthe screw without relative rotation thereof.

Signed at Chicago county lof Cook and State of -Illinois, this 30th day of July 1926.

GUNNAR EMIL ANDERSEN, 

